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高压条件下Al2O3/Al-10Si组织演变及力学性能
张艳衡1,朱冬冬2,王刚1,董多2,王晓红2
1.安徽工程大学材料科学与工程学院,芜湖 241000;2.衢州学院机械学院,衢州 324000
摘要:
采用热压烧结与高压凝固分别制备了不同压力下Al2O3/Al-10Si复合材料,研究了高压对Al2O3/Al-10Si复合材料的组织演变规律及力学性能的影响。结果表明,高压凝固Al2O3/Al-10Si复合材料由α相,β相和Al2O3强化相组成,其中α相呈胞状,在α相晶界处存在少量粒径约为0.1 μm的颗粒状β相;对于不同压力下制备的复合材料性能研究发现,凝固压力增加,α相中Si的固溶度增加,显微硬度及拉伸强度也随之提高,显微硬度由热压烧结时的55.3 HV,增加到了5 GPa时的128.1 HV,提高了133 %,拉伸强度由热压烧结时的126 MPa,增加到了5 GPa时的702 MPa,这是由于高压导致α相中Si固溶度增加,形成了固溶强化。
关键词:  高压凝固  组织形貌  凝固压力  显微硬度
DOI:10.12044/j.issn.1007-2330.2020.04.013
分类号:TG394
基金项目:国家自然科学基金(51801112,51501100,51704001);浙江省自然科学基金(LY18E010003,LQ20E010003);安徽省领军人才计划(Z175050020001);安徽工程大学拔尖人才计划
Microstructure Evolution and Mechanical Properties of Al2O3/Al-10Si Composites Under High Pressure
ZHANG Yanheng1, ZHU Dongdong2, WANG Gang1, DONG Duo2, WANG Xiaohong2
1.School of Material Science and Engineering,Anhui Polytechnic University,Wuhu 241000;2.School of Mechanical Engineering,Quzhou University,Quzhou 324000
Abstract:
Al2O3/Al-10Si composites solidified with different pressures were prepared by hot pressing and high pressure solidification.The effects of high pressure on the microstructure evolution and mechanical properties of Al2O3/Al-10Si composites were investigated.The results show that the high pressure solidified Al2O3/Al-10Si composite consists of α phase,β phase and Al2O3 strengthening phase, and α phase is cell-like.There is a small amount of fine granular β phase with a particle size of about 0.1 μm at α phase grain boundary.The solid solubility of Si in α phase and the microhardness increases with the increasing solidification pressure.The microhardness of the hot pressed sintered material is 55.3 HV.When solidification pressure is 5 GPa,the microhardness is 128 HV and has increased by 133%.The compressive strength has increased from 126 MPa to 702 MPa at 5 GPa.This is due to the high pressure causing an increase in the solid solubility of Si in α phase to form a solid solution strengthening.
Key words:  High pressure solidification  Microstructure  Solidification pressure  Microhardness